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Brazilian Journal of Chemical Engineering

Print version ISSN 0104-6632On-line version ISSN 1678-4383


MCCURDY, M.; PANG, S.  and  KEEY, R.. Experimental determination of the effect of temperature and humidity on the development of colour in Pinus radiata. Braz. J. Chem. Eng. [online]. 2005, vol.22, n.2, pp.173-179. ISSN 0104-6632.

Experiments were undertaken to determine the effects of drying conditions (temperature and humidity) on the development of kiln brown stain in radiata pine during drying. Eight schedules were tested with temperatures ranging from 50°C to 120°C and relative humidity from 14% to 67%. The variables measured were moisture content, color expressed using the CIELab color space, and nitrogen content. The experiments have shown that the kiln brown stain is influenced by drying temperature and drying time. The recommendation is therefore that low-temperature and low-humidity schedules be developed for controlling color development.

Keywords : Appearance grade; Accelerated conventional temperature; High temperature; Kiln drying; Low temperature; Color space.

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